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The Model 8870 Communicating Thermostat operates similarly to a conventional thermostat but has the unique capability of being controlled, either locally or remotely (from a home automation system). The Model 8870 thermostat is capable of integration into your home automation system or independently operated with the Aprilaire Model 8825 System Controller. *Required- 8825 Aprilaire Communicating Thermostat System Controller *Required- 8818 Aprilaire Distribution Panel *Required- 8027 Aprilaire 24V Transformer (1 per 8818 panel) *Option- 8061 Aprilaire Temperature Sensor and Control Module *Option- 8062 Aprilaire Temperature and Humidity Sensor Module *Option- 8051 Aprilaire Remote Flush Mount Temperature Sensor *Option- 8052 Aprilaire Remote Duct Mount/Outdoor Temp Sensor *Option- 8053 Surface Mount Temperature Sensor 8870 Thermostat Features • One thermostat capable of heat/cool or heat pump, single or multi-stage operation • Capable of standalone operation, independent of the thermostat network • Capable of controlling space demand requirements by sensing space temperature and determining the heating or cooling demand with a control accuracy of 1 degree • Capable of controlling temperature or relative humidity • Capable of password protection • Backlit with the option to disable back-lighting • Field adjustable differential control • Field offset capability • Ability to be configured and addressed via a menu-driven interface • Control dual-fuel heat pumps based upon outdoor high and low balance points • Display setpoint(s) and room ambient simultaneously with option to hide setpoints • Mode button for selecting heating, cooling or automatic changeover mode of operation • Button to allow the system fan to operate in continuous or automatic mode • Display multiple remote temperatures • Capable of connecting to a remote flush-mount temperature sensor in order to hide the thermostat from view • Control space temperatures to maintain individual heating and cooling setpoints Dimensions: 5.01"H X 5.52"W X 1.15"D